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A REST API (Representational State Transfer Application Programming Interface) is a set of rules and conventions for building and interacting with web services. It enables the requesting systems to access and manipulate web resources by using a uniform and predefined set of stateless operations. Here’s a breakdown of its main concepts and characteristics:
1. Representational State Transfer (REST): This is an architectural style that defines a set of constraints used for creating web services. Web services that conform to the REST architectural style, termed RESTful web services, provide interoperability between computer systems on the internet.
2. Statelessness: In the context of REST, statelessness means that each request from a client to a server must contain all the information needed to understand and complete the request. The server does not store any session information about the client. This makes the system more scalable and simpler to implement.
3. Resources: The key abstraction of information in REST is a resource. A resource is any piece of information that can be named, such as a document, an image, a temporal service (e.g., “today’s weather in Los Angeles”), a collection of other resources, a non-virtual object (e.g., a person), and so on. Resources are identified by URIs (Uniform Resource Identifiers), which provide a global addressing space for resource and service discovery.
4. HTTP Methods: REST uses standard HTTP methods to perform operations on resources. The most common HTTP methods are:
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A REST API (Representational State Transfer Application Programming Interface) is a set of rules and protocols used to build web services that allow different computer systems to communicate over the internet in a simple and standardized way. It leverages standard HTTP methods (such as GET, POST, PUT, DELETE) to create, read, update, or delete data across these systems. REST APIs are designed to be stateless, meaning each request from client to server must contain all the information needed to understand and complete the request. They use uniform resource identifiers (URIs) to address resources, which can be text, images, sounds, or other types of data. The data exchanged is often in the form of JSON (JavaScript Object Notation) or XML (Extensible Markup Language), making it easily processed by different platforms and languages.
REST APIs are widely used in web services and applications for their simplicity, scalability, and flexibility, enabling separate components of systems to communicate and use each other’s resources efficiently.